High-throughput assessment of defect-nuclear spin register controllability for quantum memory applications
arxiv(2024)
摘要
Quantum memories play a key role in facilitating tasks within quantum
networks and quantum information processing, including secure communications,
advanced quantum sensing, and distributed quantum computing. Progress in
characterizing large nuclear spin registers coupled to defect electronic spins
has been significant, but selecting memory qubits remains challenging due to
the multitude of possible assignments. Numerical simulations for evaluating
entangling gate fidelities encounter obstacles, restricting research to small
registers, while experimental investigations are time-consuming and often
limited to well-understood samples. Here we present an efficient methodology
for systematically assessing the controllability of defect systems coupled to
nuclear spin registers. We showcase the approach by investigating the
generation of entanglement links between defects in SiC and randomly selected
sets of nuclear spins within the two-species (^13C and ^29Si) nuclear
register. We quantify the performance of entangling gate operations and present
the achievable gate fidelities, considering both the size of the register and
the presence of unwanted nuclear spins. We find that some control sequences
perform better than others depending on the number of target versus bath
nuclei. This efficient approach is a guide for both experimental investigation
and engineering, facilitating the high-throughput exploration of suitable
defect systems for quantum memories.
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